Steam pile-driver.



I Unrrnn ATENT FFICE.

STEAM FILE-DRIVER.

Sl-ECIFIGATION forming part of Letters Patent N 0. 693,600, datedFebruary 18, 1902;

Application filed December 10,1900. Serial No. 39,433. (No model.)

To (ZZZ whom, it may concern:

Be it known that I, J OHANNES GRAPENGE- TER, machinist, a subject of theGerman Emperor, residing at Ankelmannstrasse 19, Hamburg, in the GermanEmpire, have invented new and useful Improvements Relating to SteamPile-Drivers, (for which I have made applications for patents inGermany, dated November 3, 1900, and in Great Britain, dated November10, 1900,) of which the following is a specification.

My invention relates to improvements in steam pile-drivers, the objectof which is to provide the ordinary steam pile-driver with a tacklehaving differential pulleys in such a manner that a pulling force isexerted upon the pile when the ram-block strikes the pile, therebyfacilitating and accelerating the driving of the pile.

The invention consists in the construction and combination of the partsdescribed herein and illustrated by the accompanying drawings, in whichFigure l is a side elevation, partly in section, of the pile-driver; andFig. 2, a front elevation of the ram-block.

Between two guide-rods a the guide-bars b are arranged, connected attheir top by a cross-head c and provided at their lower ends with aprojecting flange g, which carries the Whole apparatus and is placedupon the pile to be rammed and moved down during ramming, guided by therods Ct. The cross-head c carries the ends cl and e of the steam-pipef.The end e of the steam-pipe is connected with the hollow piston-rod h ofthe steam-cylinder t', which serves as a rain-block and is inclosed in acasing j, provided with shoes 70, which are slidingly connected with theguide-bars Z). At the outer side of said casing are fastened in asuitable manner at Z the top tackles m, provided with differentialpulleys. The bottom tackles p are fastened to the ends of the twotimbers 0, which are part of the framingtimbers a, serving as afoundation, and are slidingly movable parallel with each other. The ropeq of the engine 9, fastened to the drum .9, is carried oversuitablyarranged guide-rolls and over the pulleys of the tackles andfastened to the casingj.

The working of the apparatus is as followsi A pile is set below thecasiiigj andthe flange g,and then the valves of the ram-cylinder and ofthe engine are opened. The ram-cylindert' is prevented from followingthe direct pressure of the steam, because the piston-rod h is fastenedto the cross-head c', and therefore being movable it takes a slidemotion, similar to that of a ram-block moved by hand. In the meantimethe rope g has been tightened by the action of the engine, and as theengine is under steam-pressure the casingj is continuously under theinfluence of the tackles, and when the ram-cylinder is rushing down andstriking the bottom of the casing which rests upon the pile the pressureof the casing upon the pile is greatly enhanced by the pulling force ofthe engine, and such force will by Ms inertz'ce maintain the driving ofthe pile for a brief instant. As the pile is driven in the ram-cylinderis sliding down, follow-' ing the direction of the pile, until the pilehas been driven to the desired depth. The ramcylinder is then raised,the beams 0 drawn back, and the pile-driver moved bodily. A fresh pileis then placed beneath the ram-cylinder, the beams 0 pushed forward, andthe pile is driven, as described above.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

A steam pile-driver having a ram-block in shape of a steam-cylinderplaced in a casing which is set upon the pile to be driven and receivesthe strokes of said steam-cylinder, against'its bottom, in combinationwith rope connection of tackles with differential pulleys between thecasing and the foundation of the pile-driver and with a drum of theengine, whereby a continuous pressure is exerted upon the pile throughthe casing in the longitudinal direction of the pile.

In testimony whereof I affix my signature in presence of two witnesses.

JOIIANNES GRAPENGETER.

.Witnesses:

E. H. L. MUMMENHOFF, Orro W. HELLMRICH.

